package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * description:
 *
 * @Author zhaohaoyang
 * @Create 2025/5/22 10:20
 * @Version 1.0
 */
@Configuration
@Order(1)
public class MyGlobalFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate redisTemplate;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取请求路径
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径:"+url);
        //2.获取白名单
        if(url.contains("/login")){
            System.out.println("登录接口白名单:"+url);
            //放行
            return chain.filter(exchange);
        }

        //3.获取请求头token
        String token = request.getHeaders().getFirst("token");
        if(token==null || token.isEmpty()){
            System.out.println("token不能为空:"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //4.获取缓存中的token
        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);
        String redisKey = "token-"+userId;
        String redisToken = redisTemplate.opsForValue().get(redisKey);
        if(redisToken==null || redisToken.isEmpty()){
            System.out.println("token已过期:"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if(!token.equals(redisToken)){
            System.out.println("token错误:"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5.token续期
        redisTemplate.expire(redisToken,60, TimeUnit.MINUTES);
        //6.放行
        System.out.println("放行:"+url);
        //7.返回
        return chain.filter(exchange);
    }
}
